Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Aaron Douglas Fox, M.D.

Addiction Medicine (Internal Medicine) Physician in Bronx, NY · enumerated 2007.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1821210808

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Registry record

Entity type Individual (Type 1)

Name Dr. Aaron Douglas Fox

Credential M.D.

Sex Male

Practice address 305 East 161st Street, Bronx, NY, 10451

Phone (718) 579-2500

Fax (718) 579-2599

Enumeration date May 2, 2007

Last updated in NPPES Mar 22, 2021

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 242573 (NY) Secondary

207RA0401X Addiction Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License 242573 (NY) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

How do I verify Aaron Fox's NPI record?

Cross-check NPI 1821210808 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1821210808 active?

Yes, as of the latest NPPES snapshot, NPI 1821210808 is active (record last updated 2021-03-22).

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-03-22.